Finding the Fourth Proportional to 78,421.83, 108,221.95 and 42,612

Step by Step Solution

1. Step 1: Write the proportion equation
   78,421.83 : 108,221.95 = 42,612 : x
2. Step 2: Convert to fraction form
   78,421.83/108,221.95 = 42,612/x
3. Step 3: Cross multiply
   78,421.83x = 108,221.95 × 42,612
4. Step 4: Simplify right side
   78,421.83x = 4,611,553,733.40
5. Step 5: Solve for x
   x = 4,611,553,733.40/78,421.83
6. Step 6: Final answer
   x = 58,804.46