Finding the Fourth Proportional to 12,789.78, 19,174.95 and 10,612.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.78 : 19,174.95 = 10,612.50 : x
2. Step 2: Convert to fraction form
   12,789.78/19,174.95 = 10,612.50/x
3. Step 3: Cross multiply
   12,789.78x = 19,174.95 × 10,612.50
4. Step 4: Simplify right side
   12,789.78x = 203,494,156.88
5. Step 5: Solve for x
   x = 203,494,156.88/12,789.78
6. Step 6: Final answer
   x = 15,910.68