Finding the Fourth Proportional to 2,214.32, 3,321.35 and 915.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,214.32 : 3,321.35 = 915.76 : x
2. Step 2: Convert to fraction form
   2,214.32/3,321.35 = 915.76/x
3. Step 3: Cross multiply
   2,214.32x = 3,321.35 × 915.76
4. Step 4: Simplify right side
   2,214.32x = 3,041,538.29
5. Step 5: Solve for x
   x = 3,041,538.29/2,214.32
6. Step 6: Final answer
   x = 1,373.58