Finding the Fourth Proportional to 100,886.49, 139,190.03 and 65,100.28

Step by Step Solution

1. Step 1: Write the proportion equation
   100,886.49 : 139,190.03 = 65,100.28 : x
2. Step 2: Convert to fraction form
   100,886.49/139,190.03 = 65,100.28/x
3. Step 3: Cross multiply
   100,886.49x = 139,190.03 × 65,100.28
4. Step 4: Simplify right side
   100,886.49x = 9,061,309,600.71
5. Step 5: Solve for x
   x = 9,061,309,600.71/100,886.49
6. Step 6: Final answer
   x = 89,816.88