Finding the Fourth Proportional to 100,700.82, 138,968.73 and 55,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   100,700.82 : 138,968.73 = 55,380.78 : x
2. Step 2: Convert to fraction form
   100,700.82/138,968.73 = 55,380.78/x
3. Step 3: Cross multiply
   100,700.82x = 138,968.73 × 55,380.78
4. Step 4: Simplify right side
   100,700.82x = 7,696,196,663.01
5. Step 5: Solve for x
   x = 7,696,196,663.01/100,700.82
6. Step 6: Final answer
   x = 76,426.36