Finding the Fourth Proportional to 100,686.72, 139,019.76 and 70,538.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100,686.72 : 139,019.76 = 70,538.88 : x
2. Step 2: Convert to fraction form
   100,686.72/139,019.76 = 70,538.88/x
3. Step 3: Cross multiply
   100,686.72x = 139,019.76 × 70,538.88
4. Step 4: Simplify right side
   100,686.72x = 9,806,298,168.27
5. Step 5: Solve for x
   x = 9,806,298,168.27/100,686.72
6. Step 6: Final answer
   x = 97,394.16