Finding the Fourth Proportional to 142,595.78, 196,779.78 and 78,932.21

Step by Step Solution

1. Step 1: Write the proportion equation
   142,595.78 : 196,779.78 = 78,932.21 : x
2. Step 2: Convert to fraction form
   142,595.78/196,779.78 = 78,932.21/x
3. Step 3: Cross multiply
   142,595.78x = 196,779.78 × 78,932.21
4. Step 4: Simplify right side
   142,595.78x = 15,532,262,918.71
5. Step 5: Solve for x
   x = 15,532,262,918.71/142,595.78
6. Step 6: Final answer
   x = 108,925.12