Finding the Fourth Proportional to 387,803.63, 535,175.69 and 215,735.33

Step by Step Solution

1. Step 1: Write the proportion equation
   387,803.63 : 535,175.69 = 215,735.33 : x
2. Step 2: Convert to fraction form
   387,803.63/535,175.69 = 215,735.33/x
3. Step 3: Cross multiply
   387,803.63x = 535,175.69 × 215,735.33
4. Step 4: Simplify right side
   387,803.63x = 115,456,300,335.57
5. Step 5: Solve for x
   x = 115,456,300,335.57/387,803.63
6. Step 6: Final answer
   x = 297,718.47