Finding the Third Proportional to 387,117 and 910,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,117 : 910,912.50 = 910,912.50 : x
2. Step 2: Convert to fraction form
   387,117/910,912.50 = 910,912.50/x
3. Step 3: Cross multiply
   387,117x = 910,912.50 × 910,912.50
4. Step 4: Simplify right side
   387,117x = 829,761,582,656.25
5. Step 5: Solve for x
   x = 829,761,582,656.25/387,117
6. Step 6: Final answer
   x = 2,143,438.76