Finding the Fourth Proportional to 121,131.68, 167,066.88 and 78,704

Step by Step Solution

1. Step 1: Write the proportion equation
   121,131.68 : 167,066.88 = 78,704 : x
2. Step 2: Convert to fraction form
   121,131.68/167,066.88 = 78,704/x
3. Step 3: Cross multiply
   121,131.68x = 167,066.88 × 78,704
4. Step 4: Simplify right side
   121,131.68x = 13,148,831,723.52
5. Step 5: Solve for x
   x = 13,148,831,723.52/121,131.68
6. Step 6: Final answer
   x = 108,549.90