Finding the Fourth Proportional to 260,310.27, 390,395.33 and 91,808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   260,310.27 : 390,395.33 = 91,808.72 : x
2. Step 2: Convert to fraction form
   260,310.27/390,395.33 = 91,808.72/x
3. Step 3: Cross multiply
   260,310.27x = 390,395.33 × 91,808.72
4. Step 4: Simplify right side
   260,310.27x = 35,841,696,698.32
5. Step 5: Solve for x
   x = 35,841,696,698.32/260,310.27
6. Step 6: Final answer
   x = 137,688.37