Finding the Fourth Proportional to 207,398.34, 311,097.30 and 57,638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   207,398.34 : 311,097.30 = 57,638.56 : x
2. Step 2: Convert to fraction form
   207,398.34/311,097.30 = 57,638.56/x
3. Step 3: Cross multiply
   207,398.34x = 311,097.30 × 57,638.56
4. Step 4: Simplify right side
   207,398.34x = 17,931,200,391.89
5. Step 5: Solve for x
   x = 17,931,200,391.89/207,398.34
6. Step 6: Final answer
   x = 86,457.78