Finding the Fourth Proportional to 42,113.16, 63,168.72 and 12,531.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,113.16 : 63,168.72 = 12,531.28 : x
2. Step 2: Convert to fraction form
   42,113.16/63,168.72 = 12,531.28/x
3. Step 3: Cross multiply
   42,113.16x = 63,168.72 × 12,531.28
4. Step 4: Simplify right side
   42,113.16x = 791,584,917.56
5. Step 5: Solve for x
   x = 791,584,917.56/42,113.16
6. Step 6: Final answer
   x = 18,796.62