Finding the Third Proportional to 64,458 and 99,602.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,458 : 99,602.50 = 99,602.50 : x
2. Step 2: Convert to fraction form
   64,458/99,602.50 = 99,602.50/x
3. Step 3: Cross multiply
   64,458x = 99,602.50 × 99,602.50
4. Step 4: Simplify right side
   64,458x = 9,920,658,006.25
5. Step 5: Solve for x
   x = 9,920,658,006.25/64,458
6. Step 6: Final answer
   x = 153,908.87