Finding the Fourth Proportional to 1,531.35, 2,113.59 and 972.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.35 : 2,113.59 = 972.59 : x
2. Step 2: Convert to fraction form
   1,531.35/2,113.59 = 972.59/x
3. Step 3: Cross multiply
   1,531.35x = 2,113.59 × 972.59
4. Step 4: Simplify right side
   1,531.35x = 2,055,649.58
5. Step 5: Solve for x
   x = 2,055,649.58/1,531.35
6. Step 6: Final answer
   x = 1,342.38