Finding the Fourth Proportional to 1,061.79, 1,465.20 and 688.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.79 : 1,465.20 = 688.98 : x
2. Step 2: Convert to fraction form
   1,061.79/1,465.20 = 688.98/x
3. Step 3: Cross multiply
   1,061.79x = 1,465.20 × 688.98
4. Step 4: Simplify right side
   1,061.79x = 1,009,493.50
5. Step 5: Solve for x
   x = 1,009,493.50/1,061.79
6. Step 6: Final answer
   x = 950.75