Finding the Fourth Proportional to 78,509.72, 108,343.94 and 42,700

Step by Step Solution

1. Step 1: Write the proportion equation
   78,509.72 : 108,343.94 = 42,700 : x
2. Step 2: Convert to fraction form
   78,509.72/108,343.94 = 42,700/x
3. Step 3: Cross multiply
   78,509.72x = 108,343.94 × 42,700
4. Step 4: Simplify right side
   78,509.72x = 4,626,286,238
5. Step 5: Solve for x
   x = 4,626,286,238/78,509.72
6. Step 6: Final answer
   x = 58,926.29