Finding the Fourth Proportional to 42,117.16, 63,174.72 and 12,535.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,117.16 : 63,174.72 = 12,535.28 : x
2. Step 2: Convert to fraction form
   42,117.16/63,174.72 = 12,535.28/x
3. Step 3: Cross multiply
   42,117.16x = 63,174.72 × 12,535.28
4. Step 4: Simplify right side
   42,117.16x = 791,912,804.12
5. Step 5: Solve for x
   x = 791,912,804.12/42,117.16
6. Step 6: Final answer
   x = 18,802.62