Finding the Fourth Proportional to 328,100.60, 492,090.15 and 91,394.30

Step by Step Solution

1. Step 1: Write the proportion equation
   328,100.60 : 492,090.15 = 91,394.30 : x
2. Step 2: Convert to fraction form
   328,100.60/492,090.15 = 91,394.30/x
3. Step 3: Cross multiply
   328,100.60x = 492,090.15 × 91,394.30
4. Step 4: Simplify right side
   328,100.60x = 44,974,234,796.15
5. Step 5: Solve for x
   x = 44,974,234,796.15/328,100.60
6. Step 6: Final answer
   x = 137,074.53