Finding the Fourth Proportional to 142,407.30, 196,523.34 and 78,749.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,407.30 : 196,523.34 = 78,749.40 : x
2. Step 2: Convert to fraction form
   142,407.30/196,523.34 = 78,749.40/x
3. Step 3: Cross multiply
   142,407.30x = 196,523.34 × 78,749.40
4. Step 4: Simplify right side
   142,407.30x = 15,476,095,111.00
5. Step 5: Solve for x
   x = 15,476,095,111.00/142,407.30
6. Step 6: Final answer
   x = 108,674.87