Finding the Fourth Proportional to 1,415.48, 2,124.56 and 868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.48 : 2,124.56 = 868.72 : x
2. Step 2: Convert to fraction form
   1,415.48/2,124.56 = 868.72/x
3. Step 3: Cross multiply
   1,415.48x = 2,124.56 × 868.72
4. Step 4: Simplify right side
   1,415.48x = 1,845,647.76
5. Step 5: Solve for x
   x = 1,845,647.76/1,415.48
6. Step 6: Final answer
   x = 1,303.90