Finding the Fourth Proportional to 319,688.69, 479,528.86 and 91,990.25

Step by Step Solution

1. Step 1: Write the proportion equation
   319,688.69 : 479,528.86 = 91,990.25 : x
2. Step 2: Convert to fraction form
   319,688.69/479,528.86 = 91,990.25/x
3. Step 3: Cross multiply
   319,688.69x = 479,528.86 × 91,990.25
4. Step 4: Simplify right side
   319,688.69x = 44,111,981,027.43
5. Step 5: Solve for x
   x = 44,111,981,027.43/319,688.69
6. Step 6: Final answer
   x = 137,984.18