Finding the Fourth Proportional to 172,631,109.30, 258,521,511.15 and 81,648,410.10

Step by Step Solution

1. Step 1: Write the proportion equation
   172,631,109.30 : 258,521,511.15 = 81,648,410.10 : x
2. Step 2: Convert to fraction form
   172,631,109.30/258,521,511.15 = 81,648,410.10/x
3. Step 3: Cross multiply
   172,631,109.30x = 258,521,511.15 × 81,648,410.10
4. Step 4: Simplify right side
   172,631,109.30x = 21,107,870,362,046,920
5. Step 5: Solve for x
   x = 21,107,870,362,046,920/172,631,109.30
6. Step 6: Final answer
   x = 122,271,532.91