Finding the Fourth Proportional to 1,108.76, 1,529.96 and 688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.76 : 1,529.96 = 688.50 : x
2. Step 2: Convert to fraction form
   1,108.76/1,529.96 = 688.50/x
3. Step 3: Cross multiply
   1,108.76x = 1,529.96 × 688.50
4. Step 4: Simplify right side
   1,108.76x = 1,053,374.02
5. Step 5: Solve for x
   x = 1,053,374.02/1,108.76
6. Step 6: Final answer
   x = 950.05