Finding the Fourth Proportional to 103,685.35, 155,692.05 and 78,753.55

Step by Step Solution

1. Step 1: Write the proportion equation
   103,685.35 : 155,692.05 = 78,753.55 : x
2. Step 2: Convert to fraction form
   103,685.35/155,692.05 = 78,753.55/x
3. Step 3: Cross multiply
   103,685.35x = 155,692.05 × 78,753.55
4. Step 4: Simplify right side
   103,685.35x = 12,261,301,644.28
5. Step 5: Solve for x
   x = 12,261,301,644.28/103,685.35
6. Step 6: Final answer
   x = 118,254.91