Finding the Fourth Proportional to 1,915.20, 2,641.56 and 1,417.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.20 : 2,641.56 = 1,417.86 : x
2. Step 2: Convert to fraction form
   1,915.20/2,641.56 = 1,417.86/x
3. Step 3: Cross multiply
   1,915.20x = 2,641.56 × 1,417.86
4. Step 4: Simplify right side
   1,915.20x = 3,745,362.26
5. Step 5: Solve for x
   x = 3,745,362.26/1,915.20
6. Step 6: Final answer
   x = 1,955.60