Finding the Fourth Proportional to 278,856.57, 384,821.76 and 151,531.86

Step by Step Solution

1. Step 1: Write the proportion equation
   278,856.57 : 384,821.76 = 151,531.86 : x
2. Step 2: Convert to fraction form
   278,856.57/384,821.76 = 151,531.86/x
3. Step 3: Cross multiply
   278,856.57x = 384,821.76 × 151,531.86
4. Step 4: Simplify right side
   278,856.57x = 58,312,757,061.27
5. Step 5: Solve for x
   x = 58,312,757,061.27/278,856.57
6. Step 6: Final answer
   x = 209,113.80