Finding the Fourth Proportional to 99,784.68, 137,676.56 and 56,764.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99,784.68 : 137,676.56 = 56,764.56 : x
2. Step 2: Convert to fraction form
   99,784.68/137,676.56 = 56,764.56/x
3. Step 3: Cross multiply
   99,784.68x = 137,676.56 × 56,764.56
4. Step 4: Simplify right side
   99,784.68x = 7,815,149,066.89
5. Step 5: Solve for x
   x = 7,815,149,066.89/99,784.68
6. Step 6: Final answer
   x = 78,320.13