Finding the Fourth Proportional to 90,012.51, 134,892.00 and 68,870.70

Step by Step Solution

1. Step 1: Write the proportion equation
   90,012.51 : 134,892.00 = 68,870.70 : x
2. Step 2: Convert to fraction form
   90,012.51/134,892.00 = 68,870.70/x
3. Step 3: Cross multiply
   90,012.51x = 134,892.00 × 68,870.70
4. Step 4: Simplify right side
   90,012.51x = 9,290,107,059.90
5. Step 5: Solve for x
   x = 9,290,107,059.90/90,012.51
6. Step 6: Final answer
   x = 103,209.06