Finding the Fourth Proportional to 278,478.42, 417,155.82 and 128,510.38

Step by Step Solution

1. Step 1: Write the proportion equation
   278,478.42 : 417,155.82 = 128,510.38 : x
2. Step 2: Convert to fraction form
   278,478.42/417,155.82 = 128,510.38/x
3. Step 3: Cross multiply
   278,478.42x = 417,155.82 × 128,510.38
4. Step 4: Simplify right side
   278,478.42x = 53,608,852,947.41
5. Step 5: Solve for x
   x = 53,608,852,947.41/278,478.42
6. Step 6: Final answer
   x = 192,506.31