Finding the Fourth Proportional to 1,531.88, 2,113.63 and 972.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.88 : 2,113.63 = 972.15 : x
2. Step 2: Convert to fraction form
   1,531.88/2,113.63 = 972.15/x
3. Step 3: Cross multiply
   1,531.88x = 2,113.63 × 972.15
4. Step 4: Simplify right side
   1,531.88x = 2,054,766.94
5. Step 5: Solve for x
   x = 2,054,766.94/1,531.88
6. Step 6: Final answer
   x = 1,341.34