Finding the Fourth Proportional to 78,700.26, 108,606.17 and 42,890.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,700.26 : 108,606.17 = 42,890.21 : x
2. Step 2: Convert to fraction form
   78,700.26/108,606.17 = 42,890.21/x
3. Step 3: Cross multiply
   78,700.26x = 108,606.17 × 42,890.21
4. Step 4: Simplify right side
   78,700.26x = 4,658,141,168.81
5. Step 5: Solve for x
   x = 4,658,141,168.81/78,700.26
6. Step 6: Final answer
   x = 59,188.38