Finding the Fourth Proportional to 99,672.65, 137,543.21 and 56,651.01

Step by Step Solution

1. Step 1: Write the proportion equation
   99,672.65 : 137,543.21 = 56,651.01 : x
2. Step 2: Convert to fraction form
   99,672.65/137,543.21 = 56,651.01/x
3. Step 3: Cross multiply
   99,672.65x = 137,543.21 × 56,651.01
4. Step 4: Simplify right side
   99,672.65x = 7,791,961,481.89
5. Step 5: Solve for x
   x = 7,791,961,481.89/99,672.65
6. Step 6: Final answer
   x = 78,175.53