Finding the Fourth Proportional to 76,499.59, 105,567.34 and 42,507.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,499.59 : 105,567.34 = 42,507.21 : x
2. Step 2: Convert to fraction form
   76,499.59/105,567.34 = 42,507.21/x
3. Step 3: Cross multiply
   76,499.59x = 105,567.34 × 42,507.21
4. Step 4: Simplify right side
   76,499.59x = 4,487,372,509.33
5. Step 5: Solve for x
   x = 4,487,372,509.33/76,499.59
6. Step 6: Final answer
   x = 58,658.78