Finding the Fourth Proportional to 28,092.60, 42,128.64 and 10,557.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,092.60 : 42,128.64 = 10,557.72 : x
2. Step 2: Convert to fraction form
   28,092.60/42,128.64 = 10,557.72/x
3. Step 3: Cross multiply
   28,092.60x = 42,128.64 × 10,557.72
4. Step 4: Simplify right side
   28,092.60x = 444,782,385.10
5. Step 5: Solve for x
   x = 444,782,385.10/28,092.60
6. Step 6: Final answer
   x = 15,832.72