Finding the Third Proportional to 81,557,728.50 and 123,521,139

Step by Step Solution

1. Step 1: Write the proportion equation
   81,557,728.50 : 123,521,139 = 123,521,139 : x
2. Step 2: Convert to fraction form
   81,557,728.50/123,521,139 = 123,521,139/x
3. Step 3: Cross multiply
   81,557,728.50x = 123,521,139 × 123,521,139
4. Step 4: Simplify right side
   81,557,728.50x = 15,257,471,779,857,320
5. Step 5: Solve for x
   x = 15,257,471,779,857,320/81,557,728.50
6. Step 6: Final answer
   x = 187,075,732.25