Finding the Third Proportional to 99,386 and 212,973.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,386 : 212,973.50 = 212,973.50 : x
2. Step 2: Convert to fraction form
   99,386/212,973.50 = 212,973.50/x
3. Step 3: Cross multiply
   99,386x = 212,973.50 × 212,973.50
4. Step 4: Simplify right side
   99,386x = 45,357,711,702.25
5. Step 5: Solve for x
   x = 45,357,711,702.25/99,386
6. Step 6: Final answer
   x = 456,379.29