Finding the Fourth Proportional to 77.89, 107.50 and 42.93

Step by Step Solution

1. Step 1: Write the proportion equation
   77.89 : 107.50 = 42.93 : x
2. Step 2: Convert to fraction form
   77.89/107.50 = 42.93/x
3. Step 3: Cross multiply
   77.89x = 107.50 × 42.93
4. Step 4: Simplify right side
   77.89x = 4,614.22
5. Step 5: Solve for x
   x = 4,614.22/77.89
6. Step 6: Final answer
   x = 59.24