Finding the Fourth Proportional to 121,742.64, 168,111.72 and 76,499.01

Step by Step Solution

1. Step 1: Write the proportion equation
   121,742.64 : 168,111.72 = 76,499.01 : x
2. Step 2: Convert to fraction form
   121,742.64/168,111.72 = 76,499.01/x
3. Step 3: Cross multiply
   121,742.64x = 168,111.72 × 76,499.01
4. Step 4: Simplify right side
   121,742.64x = 12,860,380,149.40
5. Step 5: Solve for x
   x = 12,860,380,149.40/121,742.64
6. Step 6: Final answer
   x = 105,635.79