Finding the Fourth Proportional to 155,005.20, 212,066.55 and 154,341.72

Step by Step Solution

1. Step 1: Write the proportion equation
   155,005.20 : 212,066.55 = 154,341.72 : x
2. Step 2: Convert to fraction form
   155,005.20/212,066.55 = 154,341.72/x
3. Step 3: Cross multiply
   155,005.20x = 212,066.55 × 154,341.72
4. Step 4: Simplify right side
   155,005.20x = 32,730,716,081.47
5. Step 5: Solve for x
   x = 32,730,716,081.47/155,005.20
6. Step 6: Final answer
   x = 211,158.83