Finding the Fourth Proportional to 1,417.20, 2,123.72 and 1,007.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.20 : 2,123.72 = 1,007.12 : x
2. Step 2: Convert to fraction form
   1,417.20/2,123.72 = 1,007.12/x
3. Step 3: Cross multiply
   1,417.20x = 2,123.72 × 1,007.12
4. Step 4: Simplify right side
   1,417.20x = 2,138,840.89
5. Step 5: Solve for x
   x = 2,138,840.89/1,417.20
6. Step 6: Final answer
   x = 1,509.20