Finding the Fourth Proportional to 281,145.14, 387,989.98 and 153,820.72

Step by Step Solution

1. Step 1: Write the proportion equation
   281,145.14 : 387,989.98 = 153,820.72 : x
2. Step 2: Convert to fraction form
   281,145.14/387,989.98 = 153,820.72/x
3. Step 3: Cross multiply
   281,145.14x = 387,989.98 × 153,820.72
4. Step 4: Simplify right side
   281,145.14x = 59,680,898,076.39
5. Step 5: Solve for x
   x = 59,680,898,076.39/281,145.14
6. Step 6: Final answer
   x = 212,277.89