Finding the Fourth Proportional to 284,002.72, 391,923.70 and 156,678.30

Step by Step Solution

1. Step 1: Write the proportion equation
   284,002.72 : 391,923.70 = 156,678.30 : x
2. Step 2: Convert to fraction form
   284,002.72/391,923.70 = 156,678.30/x
3. Step 3: Cross multiply
   284,002.72x = 391,923.70 × 156,678.30
4. Step 4: Simplify right side
   284,002.72x = 61,405,939,045.71
5. Step 5: Solve for x
   x = 61,405,939,045.71/284,002.72
6. Step 6: Final answer
   x = 216,216.02