Finding the Fourth Proportional to 39,642.72, 59,456.51 and 19,915.80

Step by Step Solution

1. Step 1: Write the proportion equation
   39,642.72 : 59,456.51 = 19,915.80 : x
2. Step 2: Convert to fraction form
   39,642.72/59,456.51 = 19,915.80/x
3. Step 3: Cross multiply
   39,642.72x = 59,456.51 × 19,915.80
4. Step 4: Simplify right side
   39,642.72x = 1,184,123,961.86
5. Step 5: Solve for x
   x = 1,184,123,961.86/39,642.72
6. Step 6: Final answer
   x = 29,869.90