Finding the Fourth Proportional to 78,538.19, 108,379.55 and 42,728.34

Step by Step Solution

1. Step 1: Write the proportion equation
   78,538.19 : 108,379.55 = 42,728.34 : x
2. Step 2: Convert to fraction form
   78,538.19/108,379.55 = 42,728.34/x
3. Step 3: Cross multiply
   78,538.19x = 108,379.55 × 42,728.34
4. Step 4: Simplify right side
   78,538.19x = 4,630,878,047.81
5. Step 5: Solve for x
   x = 4,630,878,047.81/78,538.19
6. Step 6: Final answer
   x = 58,963.40