Finding the Fourth Proportional to 28,086.32, 42,123 and 10,557.92

Step by Step Solution

1. Step 1: Write the proportion equation
   28,086.32 : 42,123 = 10,557.92 : x
2. Step 2: Convert to fraction form
   28,086.32/42,123 = 10,557.92/x
3. Step 3: Cross multiply
   28,086.32x = 42,123 × 10,557.92
4. Step 4: Simplify right side
   28,086.32x = 444,731,264.16
5. Step 5: Solve for x
   x = 444,731,264.16/28,086.32
6. Step 6: Final answer
   x = 15,834.44