Finding the Fourth Proportional to 689,792.72, 951,904.20 and 387,986

Step by Step Solution

1. Step 1: Write the proportion equation
   689,792.72 : 951,904.20 = 387,986 : x
2. Step 2: Convert to fraction form
   689,792.72/951,904.20 = 387,986/x
3. Step 3: Cross multiply
   689,792.72x = 951,904.20 × 387,986
4. Step 4: Simplify right side
   689,792.72x = 369,325,502,941.20
5. Step 5: Solve for x
   x = 369,325,502,941.20/689,792.72
6. Step 6: Final answer
   x = 535,415.19