Finding the Fourth Proportional to 90,465.30, 135,503.55 and 78,801.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90,465.30 : 135,503.55 = 78,801.30 : x
2. Step 2: Convert to fraction form
   90,465.30/135,503.55 = 78,801.30/x
3. Step 3: Cross multiply
   90,465.30x = 135,503.55 × 78,801.30
4. Step 4: Simplify right side
   90,465.30x = 10,677,855,894.62
5. Step 5: Solve for x
   x = 10,677,855,894.62/90,465.30
6. Step 6: Final answer
   x = 118,032.61