Finding the Fourth Proportional to 42,118.50, 63,177.49 and 10,528.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,118.50 : 63,177.49 = 10,528.40 : x
2. Step 2: Convert to fraction form
   42,118.50/63,177.49 = 10,528.40/x
3. Step 3: Cross multiply
   42,118.50x = 63,177.49 × 10,528.40
4. Step 4: Simplify right side
   42,118.50x = 665,157,885.72
5. Step 5: Solve for x
   x = 665,157,885.72/42,118.50
6. Step 6: Final answer
   x = 15,792.54