Finding the Fourth Proportional to 142,196.40, 212,987.40 and 117,620.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,196.40 : 212,987.40 = 117,620.40 : x
2. Step 2: Convert to fraction form
   142,196.40/212,987.40 = 117,620.40/x
3. Step 3: Cross multiply
   142,196.40x = 212,987.40 × 117,620.40
4. Step 4: Simplify right side
   142,196.40x = 25,051,663,182.96
5. Step 5: Solve for x
   x = 25,051,663,182.96/142,196.40
6. Step 6: Final answer
   x = 176,176.49