Finding the Fourth Proportional to 78,270.42, 117,301.80 and 42,640.34

Step by Step Solution

1. Step 1: Write the proportion equation
   78,270.42 : 117,301.80 = 42,640.34 : x
2. Step 2: Convert to fraction form
   78,270.42/117,301.80 = 42,640.34/x
3. Step 3: Cross multiply
   78,270.42x = 117,301.80 × 42,640.34
4. Step 4: Simplify right side
   78,270.42x = 5,001,788,634.61
5. Step 5: Solve for x
   x = 5,001,788,634.61/78,270.42
6. Step 6: Final answer
   x = 63,903.95