Finding the Fourth Proportional to 28,932.57, 43,404.27 and 13,138.71

Step by Step Solution

1. Step 1: Write the proportion equation
   28,932.57 : 43,404.27 = 13,138.71 : x
2. Step 2: Convert to fraction form
   28,932.57/43,404.27 = 13,138.71/x
3. Step 3: Cross multiply
   28,932.57x = 43,404.27 × 13,138.71
4. Step 4: Simplify right side
   28,932.57x = 570,276,116.29
5. Step 5: Solve for x
   x = 570,276,116.29/28,932.57
6. Step 6: Final answer
   x = 19,710.52