Finding the Fourth Proportional to 100,873.70, 139,213.12 and 72,196.04

Step by Step Solution

1. Step 1: Write the proportion equation
   100,873.70 : 139,213.12 = 72,196.04 : x
2. Step 2: Convert to fraction form
   100,873.70/139,213.12 = 72,196.04/x
3. Step 3: Cross multiply
   100,873.70x = 139,213.12 × 72,196.04
4. Step 4: Simplify right side
   100,873.70x = 10,050,635,980.04
5. Step 5: Solve for x
   x = 10,050,635,980.04/100,873.70
6. Step 6: Final answer
   x = 99,635.84