Finding the Fourth Proportional to 90,002.70, 134,842.05 and 71,405.10

Step by Step Solution

1. Step 1: Write the proportion equation
   90,002.70 : 134,842.05 = 71,405.10 : x
2. Step 2: Convert to fraction form
   90,002.70/134,842.05 = 71,405.10/x
3. Step 3: Cross multiply
   90,002.70x = 134,842.05 × 71,405.10
4. Step 4: Simplify right side
   90,002.70x = 9,628,410,064.46
5. Step 5: Solve for x
   x = 9,628,410,064.46/90,002.70
6. Step 6: Final answer
   x = 106,979.12