Finding the Fourth Proportional to 1,061.64, 1,465.43 and 619.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.64 : 1,465.43 = 619.92 : x
2. Step 2: Convert to fraction form
   1,061.64/1,465.43 = 619.92/x
3. Step 3: Cross multiply
   1,061.64x = 1,465.43 × 619.92
4. Step 4: Simplify right side
   1,061.64x = 908,446.27
5. Step 5: Solve for x
   x = 908,446.27/1,061.64
6. Step 6: Final answer
   x = 855.70