Finding the Fourth Proportional to 100,819.32, 138,897.74 and 72,475.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100,819.32 : 138,897.74 = 72,475.96 : x
2. Step 2: Convert to fraction form
   100,819.32/138,897.74 = 72,475.96/x
3. Step 3: Cross multiply
   100,819.32x = 138,897.74 × 72,475.96
4. Step 4: Simplify right side
   100,819.32x = 10,066,747,048.33
5. Step 5: Solve for x
   x = 10,066,747,048.33/100,819.32
6. Step 6: Final answer
   x = 99,849.38