Finding the Fourth Proportional to 101,988.72, 140,743.98 and 56,674.08

Step by Step Solution

1. Step 1: Write the proportion equation
   101,988.72 : 140,743.98 = 56,674.08 : x
2. Step 2: Convert to fraction form
   101,988.72/140,743.98 = 56,674.08/x
3. Step 3: Cross multiply
   101,988.72x = 140,743.98 × 56,674.08
4. Step 4: Simplify right side
   101,988.72x = 7,976,535,582.04
5. Step 5: Solve for x
   x = 7,976,535,582.04/101,988.72
6. Step 6: Final answer
   x = 78,209.98