Finding the Fourth Proportional to 78,390.50, 118,108.72 and 70,902.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,390.50 : 118,108.72 = 70,902.69 : x
2. Step 2: Convert to fraction form
   78,390.50/118,108.72 = 70,902.69/x
3. Step 3: Cross multiply
   78,390.50x = 118,108.72 × 70,902.69
4. Step 4: Simplify right side
   78,390.50x = 8,374,226,469.95
5. Step 5: Solve for x
   x = 8,374,226,469.95/78,390.50
6. Step 6: Final answer
   x = 106,827.06