Finding the Fourth Proportional to 28,344.42, 42,498.40 and 13,553.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28,344.42 : 42,498.40 = 13,553.02 : x
2. Step 2: Convert to fraction form
   28,344.42/42,498.40 = 13,553.02/x
3. Step 3: Cross multiply
   28,344.42x = 42,498.40 × 13,553.02
4. Step 4: Simplify right side
   28,344.42x = 575,981,665.17
5. Step 5: Solve for x
   x = 575,981,665.17/28,344.42
6. Step 6: Final answer
   x = 20,320.81