Finding the Fourth Proportional to 90,200.84, 135,140.76 and 76,918.46

Step by Step Solution

1. Step 1: Write the proportion equation
   90,200.84 : 135,140.76 = 76,918.46 : x
2. Step 2: Convert to fraction form
   90,200.84/135,140.76 = 76,918.46/x
3. Step 3: Cross multiply
   90,200.84x = 135,140.76 × 76,918.46
4. Step 4: Simplify right side
   90,200.84x = 10,394,819,142.43
5. Step 5: Solve for x
   x = 10,394,819,142.43/90,200.84
6. Step 6: Final answer
   x = 115,240.82