Finding the Fourth Proportional to 138,667.42, 191,344.56 and 78,234.53

Step by Step Solution

1. Step 1: Write the proportion equation
   138,667.42 : 191,344.56 = 78,234.53 : x
2. Step 2: Convert to fraction form
   138,667.42/191,344.56 = 78,234.53/x
3. Step 3: Cross multiply
   138,667.42x = 191,344.56 × 78,234.53
4. Step 4: Simplify right side
   138,667.42x = 14,969,751,719.66
5. Step 5: Solve for x
   x = 14,969,751,719.66/138,667.42
6. Step 6: Final answer
   x = 107,954.35