Finding the Third Proportional to 39,915,688 and 55,612,608

Step by Step Solution

1. Step 1: Write the proportion equation
   39,915,688 : 55,612,608 = 55,612,608 : x
2. Step 2: Convert to fraction form
   39,915,688/55,612,608 = 55,612,608/x
3. Step 3: Cross multiply
   39,915,688x = 55,612,608 × 55,612,608
4. Step 4: Simplify right side
   39,915,688x = 3,092,762,168,561,664
5. Step 5: Solve for x
   x = 3,092,762,168,561,664/39,915,688
6. Step 6: Final answer
   x = 77,482,371.56