Finding the Fourth Proportional to 42,082.64, 63,113.09 and 12,493.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,082.64 : 63,113.09 = 12,493.78 : x
2. Step 2: Convert to fraction form
   42,082.64/63,113.09 = 12,493.78/x
3. Step 3: Cross multiply
   42,082.64x = 63,113.09 × 12,493.78
4. Step 4: Simplify right side
   42,082.64x = 788,521,061.58
5. Step 5: Solve for x
   x = 788,521,061.58/42,082.64
6. Step 6: Final answer
   x = 18,737.44