Finding the Third Proportional to 99,531.31 and 216,558

Step by Step Solution

1. Step 1: Write the proportion equation
   99,531.31 : 216,558 = 216,558 : x
2. Step 2: Convert to fraction form
   99,531.31/216,558 = 216,558/x
3. Step 3: Cross multiply
   99,531.31x = 216,558 × 216,558
4. Step 4: Simplify right side
   99,531.31x = 46,897,367,364
5. Step 5: Solve for x
   x = 46,897,367,364/99,531.31
6. Step 6: Final answer
   x = 471,182.04