Finding the Fourth Proportional to 387,084.96, 534,186.72 and 217,314.72

Step by Step Solution

1. Step 1: Write the proportion equation
   387,084.96 : 534,186.72 = 217,314.72 : x
2. Step 2: Convert to fraction form
   387,084.96/534,186.72 = 217,314.72/x
3. Step 3: Cross multiply
   387,084.96x = 534,186.72 × 217,314.72
4. Step 4: Simplify right side
   387,084.96x = 116,086,637,484.52
5. Step 5: Solve for x
   x = 116,086,637,484.52/387,084.96
6. Step 6: Final answer
   x = 299,899.63