Finding the Fourth Proportional to 297,498.69, 445,868.91 and 139,378.59

Step by Step Solution

1. Step 1: Write the proportion equation
   297,498.69 : 445,868.91 = 139,378.59 : x
2. Step 2: Convert to fraction form
   297,498.69/445,868.91 = 139,378.59/x
3. Step 3: Cross multiply
   297,498.69x = 445,868.91 × 139,378.59
4. Step 4: Simplify right side
   297,498.69x = 62,144,580,000.64
5. Step 5: Solve for x
   x = 62,144,580,000.64/297,498.69
6. Step 6: Final answer
   x = 208,890.26