Finding the Fourth Proportional to 120,667.34, 180,705.62 and 85,041.10

Step by Step Solution

1. Step 1: Write the proportion equation
   120,667.34 : 180,705.62 = 85,041.10 : x
2. Step 2: Convert to fraction form
   120,667.34/180,705.62 = 85,041.10/x
3. Step 3: Cross multiply
   120,667.34x = 180,705.62 × 85,041.10
4. Step 4: Simplify right side
   120,667.34x = 15,367,404,700.98
5. Step 5: Solve for x
   x = 15,367,404,700.98/120,667.34
6. Step 6: Final answer
   x = 127,353.47