Finding the Fourth Proportional to 100,507.50, 138,700.42 and 55,795.50

Step by Step Solution

1. Step 1: Write the proportion equation
   100,507.50 : 138,700.42 = 55,795.50 : x
2. Step 2: Convert to fraction form
   100,507.50/138,700.42 = 55,795.50/x
3. Step 3: Cross multiply
   100,507.50x = 138,700.42 × 55,795.50
4. Step 4: Simplify right side
   100,507.50x = 7,738,859,144.62
5. Step 5: Solve for x
   x = 7,738,859,144.62/100,507.50
6. Step 6: Final answer
   x = 76,997.83