Finding the Fourth Proportional to 284,019.78, 391,948.56 and 156,699.12

Step by Step Solution

1. Step 1: Write the proportion equation
   284,019.78 : 391,948.56 = 156,699.12 : x
2. Step 2: Convert to fraction form
   284,019.78/391,948.56 = 156,699.12/x
3. Step 3: Cross multiply
   284,019.78x = 391,948.56 × 156,699.12
4. Step 4: Simplify right side
   284,019.78x = 61,417,994,437.27
5. Step 5: Solve for x
   x = 61,417,994,437.27/284,019.78
6. Step 6: Final answer
   x = 216,245.48