Finding the Fourth Proportional to 99,769.32, 137,681.38 and 55,057

Step by Step Solution

1. Step 1: Write the proportion equation
   99,769.32 : 137,681.38 = 55,057 : x
2. Step 2: Convert to fraction form
   99,769.32/137,681.38 = 55,057/x
3. Step 3: Cross multiply
   99,769.32x = 137,681.38 × 55,057
4. Step 4: Simplify right side
   99,769.32x = 7,580,323,738.66
5. Step 5: Solve for x
   x = 7,580,323,738.66/99,769.32
6. Step 6: Final answer
   x = 75,978.50