Finding the Fourth Proportional to 280,978.89, 387,753.93 and 153,651.75

Step by Step Solution

1. Step 1: Write the proportion equation
   280,978.89 : 387,753.93 = 153,651.75 : x
2. Step 2: Convert to fraction form
   280,978.89/387,753.93 = 153,651.75/x
3. Step 3: Cross multiply
   280,978.89x = 387,753.93 × 153,651.75
4. Step 4: Simplify right side
   280,978.89x = 59,579,069,913.88
5. Step 5: Solve for x
   x = 59,579,069,913.88/280,978.89
6. Step 6: Final answer
   x = 212,041.09