Finding the Fourth Proportional to 90,667.27, 135,089.62 and 85,574.19

Step by Step Solution

1. Step 1: Write the proportion equation
   90,667.27 : 135,089.62 = 85,574.19 : x
2. Step 2: Convert to fraction form
   90,667.27/135,089.62 = 85,574.19/x
3. Step 3: Cross multiply
   90,667.27x = 135,089.62 × 85,574.19
4. Step 4: Simplify right side
   90,667.27x = 11,560,184,808.91
5. Step 5: Solve for x
   x = 11,560,184,808.91/90,667.27
6. Step 6: Final answer
   x = 127,501.19