Finding the Fourth Proportional to 284,009.76, 391,931.28 and 156,690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   284,009.76 : 391,931.28 = 156,690.72 : x
2. Step 2: Convert to fraction form
   284,009.76/391,931.28 = 156,690.72/x
3. Step 3: Cross multiply
   284,009.76x = 391,931.28 × 156,690.72
4. Step 4: Simplify right side
   284,009.76x = 61,411,994,453.72
5. Step 5: Solve for x
   x = 61,411,994,453.72/284,009.76
6. Step 6: Final answer
   x = 216,231.99