Finding the Fourth Proportional to 99,780.17, 137,697.91 and 58,945.63

Step by Step Solution

1. Step 1: Write the proportion equation
   99,780.17 : 137,697.91 = 58,945.63 : x
2. Step 2: Convert to fraction form
   99,780.17/137,697.91 = 58,945.63/x
3. Step 3: Cross multiply
   99,780.17x = 137,697.91 × 58,945.63
4. Step 4: Simplify right side
   99,780.17x = 8,116,689,759.91
5. Step 5: Solve for x
   x = 8,116,689,759.91/99,780.17
6. Step 6: Final answer
   x = 81,345.72