Finding the Fourth Proportional to 99,942, 137,920.32 and 55,230

Step by Step Solution

1. Step 1: Write the proportion equation
   99,942 : 137,920.32 = 55,230 : x
2. Step 2: Convert to fraction form
   99,942/137,920.32 = 55,230/x
3. Step 3: Cross multiply
   99,942x = 137,920.32 × 55,230
4. Step 4: Simplify right side
   99,942x = 7,617,339,273.60
5. Step 5: Solve for x
   x = 7,617,339,273.60/99,942
6. Step 6: Final answer
   x = 76,217.60