Finding the Fourth Proportional to 1,531.17, 2,111.67 and 1,007.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.17 : 2,111.67 = 1,007.10 : x
2. Step 2: Convert to fraction form
   1,531.17/2,111.67 = 1,007.10/x
3. Step 3: Cross multiply
   1,531.17x = 2,111.67 × 1,007.10
4. Step 4: Simplify right side
   1,531.17x = 2,126,662.86
5. Step 5: Solve for x
   x = 2,126,662.86/1,531.17
6. Step 6: Final answer
   x = 1,388.91