Finding the Fourth Proportional to 1,061.80, 1,590.30 and 715.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.80 : 1,590.30 = 715.24 : x
2. Step 2: Convert to fraction form
   1,061.80/1,590.30 = 715.24/x
3. Step 3: Cross multiply
   1,061.80x = 1,590.30 × 715.24
4. Step 4: Simplify right side
   1,061.80x = 1,137,446.17
5. Step 5: Solve for x
   x = 1,137,446.17/1,061.80
6. Step 6: Final answer
   x = 1,071.24