Finding the Fourth Proportional to 90,002.80, 134,809.80 and 78,338.80

Step by Step Solution

1. Step 1: Write the proportion equation
   90,002.80 : 134,809.80 = 78,338.80 : x
2. Step 2: Convert to fraction form
   90,002.80/134,809.80 = 78,338.80/x
3. Step 3: Cross multiply
   90,002.80x = 134,809.80 × 78,338.80
4. Step 4: Simplify right side
   90,002.80x = 10,560,837,960.24
5. Step 5: Solve for x
   x = 10,560,837,960.24/90,002.80
6. Step 6: Final answer
   x = 117,338.99