Finding the Fourth Proportional to 76,689.72, 105,832.89 and 42,699.69

Step by Step Solution

1. Step 1: Write the proportion equation
   76,689.72 : 105,832.89 = 42,699.69 : x
2. Step 2: Convert to fraction form
   76,689.72/105,832.89 = 42,699.69/x
3. Step 3: Cross multiply
   76,689.72x = 105,832.89 × 42,699.69
4. Step 4: Simplify right side
   76,689.72x = 4,519,031,594.80
5. Step 5: Solve for x
   x = 4,519,031,594.80/76,689.72
6. Step 6: Final answer
   x = 58,926.17