Finding the Fourth Proportional to 1,061.10, 1,598.67 and 915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.10 : 1,598.67 = 915.30 : x
2. Step 2: Convert to fraction form
   1,061.10/1,598.67 = 915.30/x
3. Step 3: Cross multiply
   1,061.10x = 1,598.67 × 915.30
4. Step 4: Simplify right side
   1,061.10x = 1,463,262.65
5. Step 5: Solve for x
   x = 1,463,262.65/1,061.10
6. Step 6: Final answer
   x = 1,379.01