Finding the Fourth Proportional to 103,654.35, 155,645.55 and 78,722.55

Step by Step Solution

1. Step 1: Write the proportion equation
   103,654.35 : 155,645.55 = 78,722.55 : x
2. Step 2: Convert to fraction form
   103,654.35/155,645.55 = 78,722.55/x
3. Step 3: Cross multiply
   103,654.35x = 155,645.55 × 78,722.55
4. Step 4: Simplify right side
   103,654.35x = 12,252,814,592.15
5. Step 5: Solve for x
   x = 12,252,814,592.15/103,654.35
6. Step 6: Final answer
   x = 118,208.40