Finding the Fourth Proportional to 328,086.10, 492,068.40 and 91,379.80

Step by Step Solution

1. Step 1: Write the proportion equation
   328,086.10 : 492,068.40 = 91,379.80 : x
2. Step 2: Convert to fraction form
   328,086.10/492,068.40 = 91,379.80/x
3. Step 3: Cross multiply
   328,086.10x = 492,068.40 × 91,379.80
4. Step 4: Simplify right side
   328,086.10x = 44,965,111,978.32
5. Step 5: Solve for x
   x = 44,965,111,978.32/328,086.10
6. Step 6: Final answer
   x = 137,052.78