Finding the Fourth Proportional to 139,191.12, 208,742.88 and 45,675.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,191.12 : 208,742.88 = 45,675.12 : x
2. Step 2: Convert to fraction form
   139,191.12/208,742.88 = 45,675.12/x
3. Step 3: Cross multiply
   139,191.12x = 208,742.88 × 45,675.12
4. Step 4: Simplify right side
   139,191.12x = 9,534,356,093.15
5. Step 5: Solve for x
   x = 9,534,356,093.15/139,191.12
6. Step 6: Final answer
   x = 68,498.31