Finding the Third Proportional to 64,721,875.50 and 139,048,812

Step by Step Solution

1. Step 1: Write the proportion equation
   64,721,875.50 : 139,048,812 = 139,048,812 : x
2. Step 2: Convert to fraction form
   64,721,875.50/139,048,812 = 139,048,812/x
3. Step 3: Cross multiply
   64,721,875.50x = 139,048,812 × 139,048,812
4. Step 4: Simplify right side
   64,721,875.50x = 19,334,572,118,611,344
5. Step 5: Solve for x
   x = 19,334,572,118,611,344/64,721,875.50
6. Step 6: Final answer
   x = 298,733,186.72