Finding the Third Proportional to 216,748,102.50 and 308,978,266.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,748,102.50 : 308,978,266.50 = 308,978,266.50 : x
2. Step 2: Convert to fraction form
   216,748,102.50/308,978,266.50 = 308,978,266.50/x
3. Step 3: Cross multiply
   216,748,102.50x = 308,978,266.50 × 308,978,266.50
4. Step 4: Simplify right side
   216,748,102.50x = 95,467,569,169,345,024
5. Step 5: Solve for x
   x = 95,467,569,169,345,024/216,748,102.50
6. Step 6: Final answer
   x = 440,454,001.99