Finding the Fourth Proportional to 99,768.89, 137,731.86 and 77,056.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99,768.89 : 137,731.86 = 77,056.89 : x
2. Step 2: Convert to fraction form
   99,768.89/137,731.86 = 77,056.89/x
3. Step 3: Cross multiply
   99,768.89x = 137,731.86 × 77,056.89
4. Step 4: Simplify right side
   99,768.89x = 10,613,188,496.55
5. Step 5: Solve for x
   x = 10,613,188,496.55/99,768.89
6. Step 6: Final answer
   x = 106,377.74