Finding the Fourth Proportional to 28,100.55, 42,146.16 and 8,374.49

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.55 : 42,146.16 = 8,374.49 : x
2. Step 2: Convert to fraction form
   28,100.55/42,146.16 = 8,374.49/x
3. Step 3: Cross multiply
   28,100.55x = 42,146.16 × 8,374.49
4. Step 4: Simplify right side
   28,100.55x = 352,952,384.73
5. Step 5: Solve for x
   x = 352,952,384.73/28,100.55
6. Step 6: Final answer
   x = 12,560.34