Finding the Fourth Proportional to 278,139,096.81, 417,112,271.42 and 139,911,278.13

Step by Step Solution

1. Step 1: Write the proportion equation
   278,139,096.81 : 417,112,271.42 = 139,911,278.13 : x
2. Step 2: Convert to fraction form
   278,139,096.81/417,112,271.42 = 139,911,278.13/x
3. Step 3: Cross multiply
   278,139,096.81x = 417,112,271.42 × 139,911,278.13
4. Step 4: Simplify right side
   278,139,096.81x = 58,358,711,017,380,112
5. Step 5: Solve for x
   x = 58,358,711,017,380,112/278,139,096.81
6. Step 6: Final answer
   x = 209,818,438.64