Finding the Fourth Proportional to 128,815.83, 193,279.37 and 69,693.12

Step by Step Solution

1. Step 1: Write the proportion equation
   128,815.83 : 193,279.37 = 69,693.12 : x
2. Step 2: Convert to fraction form
   128,815.83/193,279.37 = 69,693.12/x
3. Step 3: Cross multiply
   128,815.83x = 193,279.37 × 69,693.12
4. Step 4: Simplify right side
   128,815.83x = 13,470,241,978.47
5. Step 5: Solve for x
   x = 13,470,241,978.47/128,815.83
6. Step 6: Final answer
   x = 104,569.77