Finding the Fourth Proportional to 42,123.72, 63,154.37 and 19,911.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,123.72 : 63,154.37 = 19,911.15 : x
2. Step 2: Convert to fraction form
   42,123.72/63,154.37 = 19,911.15/x
3. Step 3: Cross multiply
   42,123.72x = 63,154.37 × 19,911.15
4. Step 4: Simplify right side
   42,123.72x = 1,257,475,718.90
5. Step 5: Solve for x
   x = 1,257,475,718.90/42,123.72
6. Step 6: Final answer
   x = 29,851.96