Finding the Fourth Proportional to 278,005.50, 417,011.90 and 91,017

Step by Step Solution

1. Step 1: Write the proportion equation
   278,005.50 : 417,011.90 = 91,017 : x
2. Step 2: Convert to fraction form
   278,005.50/417,011.90 = 91,017/x
3. Step 3: Cross multiply
   278,005.50x = 417,011.90 × 91,017
4. Step 4: Simplify right side
   278,005.50x = 37,955,171,647.22
5. Step 5: Solve for x
   x = 37,955,171,647.22/278,005.50
6. Step 6: Final answer
   x = 136,526.69