Finding the Fourth Proportional to 219,024.50, 328,410.99 and 85,748.72

Step by Step Solution

1. Step 1: Write the proportion equation
   219,024.50 : 328,410.99 = 85,748.72 : x
2. Step 2: Convert to fraction form
   219,024.50/328,410.99 = 85,748.72/x
3. Step 3: Cross multiply
   219,024.50x = 328,410.99 × 85,748.72
4. Step 4: Simplify right side
   219,024.50x = 28,160,820,384.38
5. Step 5: Solve for x
   x = 28,160,820,384.38/219,024.50
6. Step 6: Final answer
   x = 128,573.84