Finding the Fourth Proportional to 1,061.53, 1,465.62 and 663.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.53 : 1,465.62 = 663.80 : x
2. Step 2: Convert to fraction form
   1,061.53/1,465.62 = 663.80/x
3. Step 3: Cross multiply
   1,061.53x = 1,465.62 × 663.80
4. Step 4: Simplify right side
   1,061.53x = 972,870.61
5. Step 5: Solve for x
   x = 972,870.61/1,061.53
6. Step 6: Final answer
   x = 916.48