Finding the Fourth Proportional to 99,511, 137,323.21 and 54,189.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99,511 : 137,323.21 = 54,189.52 : x
2. Step 2: Convert to fraction form
   99,511/137,323.21 = 54,189.52/x
3. Step 3: Cross multiply
   99,511x = 137,323.21 × 54,189.52
4. Step 4: Simplify right side
   99,511x = 7,441,478,834.76
5. Step 5: Solve for x
   x = 7,441,478,834.76/99,511
6. Step 6: Final answer
   x = 74,780.46