Finding the Fourth Proportional to 78,026.40, 107,675.67 and 42,215.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,026.40 : 107,675.67 = 42,215.63 : x
2. Step 2: Convert to fraction form
   78,026.40/107,675.67 = 42,215.63/x
3. Step 3: Cross multiply
   78,026.40x = 107,675.67 × 42,215.63
4. Step 4: Simplify right side
   78,026.40x = 4,545,595,975.53
5. Step 5: Solve for x
   x = 4,545,595,975.53/78,026.40
6. Step 6: Final answer
   x = 58,257.15