Finding the Fourth Proportional to 1,531.86, 2,113.07 and 1,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.86 : 2,113.07 = 1,111.72 : x
2. Step 2: Convert to fraction form
   1,531.86/2,113.07 = 1,111.72/x
3. Step 3: Cross multiply
   1,531.86x = 2,113.07 × 1,111.72
4. Step 4: Simplify right side
   1,531.86x = 2,349,142.18
5. Step 5: Solve for x
   x = 2,349,142.18/1,531.86
6. Step 6: Final answer
   x = 1,533.53