Finding the Fourth Proportional to 28,375,492.71, 42,407,758.91 and 20,715,268.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,375,492.71 : 42,407,758.91 = 20,715,268.86 : x
2. Step 2: Convert to fraction form
   28,375,492.71/42,407,758.91 = 20,715,268.86/x
3. Step 3: Cross multiply
   28,375,492.71x = 42,407,758.91 × 20,715,268.86
4. Step 4: Simplify right side
   28,375,492.71x = 878,488,127,467,134.25
5. Step 5: Solve for x
   x = 878,488,127,467,134.25/28,375,492.71
6. Step 6: Final answer
   x = 30,959,396.42