Finding the Fourth Proportional to 28,108.60, 42,138.42 and 10,573.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,108.60 : 42,138.42 = 10,573.72 : x
2. Step 2: Convert to fraction form
   28,108.60/42,138.42 = 10,573.72/x
3. Step 3: Cross multiply
   28,108.60x = 42,138.42 × 10,573.72
4. Step 4: Simplify right side
   28,108.60x = 445,559,854.32
5. Step 5: Solve for x
   x = 445,559,854.32/28,108.60
6. Step 6: Final answer
   x = 15,851.37