Finding the Fourth Proportional to 328,564.70, 492,810.60 and 91,931.30

Step by Step Solution

1. Step 1: Write the proportion equation
   328,564.70 : 492,810.60 = 91,931.30 : x
2. Step 2: Convert to fraction form
   328,564.70/492,810.60 = 91,931.30/x
3. Step 3: Cross multiply
   328,564.70x = 492,810.60 × 91,931.30
4. Step 4: Simplify right side
   328,564.70x = 45,304,719,111.78
5. Step 5: Solve for x
   x = 45,304,719,111.78/328,564.70
6. Step 6: Final answer
   x = 137,886.75