Finding the Fourth Proportional to 99,779.92, 137,697.56 and 58,945.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,779.92 : 137,697.56 = 58,945.38 : x
2. Step 2: Convert to fraction form
   99,779.92/137,697.56 = 58,945.38/x
3. Step 3: Cross multiply
   99,779.92x = 137,697.56 × 58,945.38
4. Step 4: Simplify right side
   99,779.92x = 8,116,634,999.27
5. Step 5: Solve for x
   x = 8,116,634,999.27/99,779.92
6. Step 6: Final answer
   x = 81,345.37