Finding the Fourth Proportional to 115,491.90, 173,226.51 and 78,290.94

Step by Step Solution

1. Step 1: Write the proportion equation
   115,491.90 : 173,226.51 = 78,290.94 : x
2. Step 2: Convert to fraction form
   115,491.90/173,226.51 = 78,290.94/x
3. Step 3: Cross multiply
   115,491.90x = 173,226.51 × 78,290.94
4. Step 4: Simplify right side
   115,491.90x = 13,562,066,300.82
5. Step 5: Solve for x
   x = 13,562,066,300.82/115,491.90
6. Step 6: Final answer
   x = 117,428.72