Finding the Fourth Proportional to 290,080.27, 435,209.49 and 138,470.81

Step by Step Solution

1. Step 1: Write the proportion equation
   290,080.27 : 435,209.49 = 138,470.81 : x
2. Step 2: Convert to fraction form
   290,080.27/435,209.49 = 138,470.81/x
3. Step 3: Cross multiply
   290,080.27x = 435,209.49 × 138,470.81
4. Step 4: Simplify right side
   290,080.27x = 60,263,810,253.81
5. Step 5: Solve for x
   x = 60,263,810,253.81/290,080.27
6. Step 6: Final answer
   x = 207,748.74