Finding the Fourth Proportional to 78,209.63, 107,928.64 and 42,398.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,209.63 : 107,928.64 = 42,398.72 : x
2. Step 2: Convert to fraction form
   78,209.63/107,928.64 = 42,398.72/x
3. Step 3: Cross multiply
   78,209.63x = 107,928.64 × 42,398.72
4. Step 4: Simplify right side
   78,209.63x = 4,576,036,187.34
5. Step 5: Solve for x
   x = 4,576,036,187.34/78,209.63
6. Step 6: Final answer
   x = 58,509.88