Finding the Fourth Proportional to 278,284.68, 417,456.72 and 91,296.72

Step by Step Solution

1. Step 1: Write the proportion equation
   278,284.68 : 417,456.72 = 91,296.72 : x
2. Step 2: Convert to fraction form
   278,284.68/417,456.72 = 91,296.72/x
3. Step 3: Cross multiply
   278,284.68x = 417,456.72 × 91,296.72
4. Step 4: Simplify right side
   278,284.68x = 38,112,429,277.96
5. Step 5: Solve for x
   x = 38,112,429,277.96/278,284.68
6. Step 6: Final answer
   x = 136,954.82