Finding the Fourth Proportional to 78,700.84, 108,607.30 and 42,890.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78,700.84 : 108,607.30 = 42,890.83 : x
2. Step 2: Convert to fraction form
   78,700.84/108,607.30 = 42,890.83/x
3. Step 3: Cross multiply
   78,700.84x = 108,607.30 × 42,890.83
4. Step 4: Simplify right side
   78,700.84x = 4,658,256,862.31
5. Step 5: Solve for x
   x = 4,658,256,862.31/78,700.84
6. Step 6: Final answer
   x = 59,189.42