Finding the Fourth Proportional to 111,349.25, 166,605.38 and 78,134.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111,349.25 : 166,605.38 = 78,134.12 : x
2. Step 2: Convert to fraction form
   111,349.25/166,605.38 = 78,134.12/x
3. Step 3: Cross multiply
   111,349.25x = 166,605.38 × 78,134.12
4. Step 4: Simplify right side
   111,349.25x = 13,017,564,362.90
5. Step 5: Solve for x
   x = 13,017,564,362.90/111,349.25
6. Step 6: Final answer
   x = 116,907.52