Finding the Fourth Proportional to 99,749, 137,656.50 and 55,039.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,749 : 137,656.50 = 55,039.88 : x
2. Step 2: Convert to fraction form
   99,749/137,656.50 = 55,039.88/x
3. Step 3: Cross multiply
   99,749x = 137,656.50 × 55,039.88
4. Step 4: Simplify right side
   99,749x = 7,576,597,241.22
5. Step 5: Solve for x
   x = 7,576,597,241.22/99,749
6. Step 6: Final answer
   x = 75,956.62