Finding the Fourth Proportional to 99,300,428.45, 137,022,686.60 and 55,236,293.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,300,428.45 : 137,022,686.60 = 55,236,293.18 : x
2. Step 2: Convert to fraction form
   99,300,428.45/137,022,686.60 = 55,236,293.18/x
3. Step 3: Cross multiply
   99,300,428.45x = 137,022,686.60 × 55,236,293.18
4. Step 4: Simplify right side
   99,300,428.45x = 7,568,625,288,387,562
5. Step 5: Solve for x
   x = 7,568,625,288,387,562/99,300,428.45
6. Step 6: Final answer
   x = 76,219,462.56