Finding the Fourth Proportional to 1,108.56, 1,530.20 and 715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.56 : 1,530.20 = 715.72 : x
2. Step 2: Convert to fraction form
   1,108.56/1,530.20 = 715.72/x
3. Step 3: Cross multiply
   1,108.56x = 1,530.20 × 715.72
4. Step 4: Simplify right side
   1,108.56x = 1,095,194.74
5. Step 5: Solve for x
   x = 1,095,194.74/1,108.56
6. Step 6: Final answer
   x = 987.94