Finding the Fourth Proportional to 215,642, 297,591.72 and 120,152.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,642 : 297,591.72 = 120,152.72 : x
2. Step 2: Convert to fraction form
   215,642/297,591.72 = 120,152.72/x
3. Step 3: Cross multiply
   215,642x = 297,591.72 × 120,152.72
4. Step 4: Simplify right side
   215,642x = 35,756,454,607.48
5. Step 5: Solve for x
   x = 35,756,454,607.48/215,642
6. Step 6: Final answer
   x = 165,813.96