Finding the Fourth Proportional to 328,086.60, 492,069.15 and 91,380.30

Step by Step Solution

1. Step 1: Write the proportion equation
   328,086.60 : 492,069.15 = 91,380.30 : x
2. Step 2: Convert to fraction form
   328,086.60/492,069.15 = 91,380.30/x
3. Step 3: Cross multiply
   328,086.60x = 492,069.15 × 91,380.30
4. Step 4: Simplify right side
   328,086.60x = 44,965,426,547.75
5. Step 5: Solve for x
   x = 44,965,426,547.75/328,086.60
6. Step 6: Final answer
   x = 137,053.53