Finding the Fourth Proportional to 99,804,965.10, 149,483,498.85 and 81,889,061.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,804,965.10 : 149,483,498.85 = 81,889,061.10 : x
2. Step 2: Convert to fraction form
   99,804,965.10/149,483,498.85 = 81,889,061.10/x
3. Step 3: Cross multiply
   99,804,965.10x = 149,483,498.85 × 81,889,061.10
4. Step 4: Simplify right side
   99,804,965.10x = 12,241,063,370,769,428
5. Step 5: Solve for x
   x = 12,241,063,370,769,428/99,804,965.10
6. Step 6: Final answer
   x = 122,649,843.71