Finding the Fourth Proportional to 1,666.10, 2,499.72 and 742.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.10 : 2,499.72 = 742.30 : x
2. Step 2: Convert to fraction form
   1,666.10/2,499.72 = 742.30/x
3. Step 3: Cross multiply
   1,666.10x = 2,499.72 × 742.30
4. Step 4: Simplify right side
   1,666.10x = 1,855,542.16
5. Step 5: Solve for x
   x = 1,855,542.16/1,666.10
6. Step 6: Final answer
   x = 1,113.70