Finding the Fourth Proportional to 287,820.72, 431,731.89 and 100,788.48

Step by Step Solution

1. Step 1: Write the proportion equation
   287,820.72 : 431,731.89 = 100,788.48 : x
2. Step 2: Convert to fraction form
   287,820.72/431,731.89 = 100,788.48/x
3. Step 3: Cross multiply
   287,820.72x = 431,731.89 × 100,788.48
4. Step 4: Simplify right side
   287,820.72x = 43,513,600,960.63
5. Step 5: Solve for x
   x = 43,513,600,960.63/287,820.72
6. Step 6: Final answer
   x = 151,183.00