Finding the Fourth Proportional to 78,399.42, 108,191.94 and 42,590.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,399.42 : 108,191.94 = 42,590.12 : x
2. Step 2: Convert to fraction form
   78,399.42/108,191.94 = 42,590.12/x
3. Step 3: Cross multiply
   78,399.42x = 108,191.94 × 42,590.12
4. Step 4: Simplify right side
   78,399.42x = 4,607,907,707.63
5. Step 5: Solve for x
   x = 4,607,907,707.63/78,399.42
6. Step 6: Final answer
   x = 58,774.77