Finding the Fourth Proportional to 55,642.42, 76,891.32 and 42,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   55,642.42 : 76,891.32 = 42,188.72 : x
2. Step 2: Convert to fraction form
   55,642.42/76,891.32 = 42,188.72/x
3. Step 3: Cross multiply
   55,642.42x = 76,891.32 × 42,188.72
4. Step 4: Simplify right side
   55,642.42x = 3,243,946,562.14
5. Step 5: Solve for x
   x = 3,243,946,562.14/55,642.42
6. Step 6: Final answer
   x = 58,299.89