Finding the Fourth Proportional to 100,987.02, 139,355.76 and 55,662.51

Step by Step Solution

1. Step 1: Write the proportion equation
   100,987.02 : 139,355.76 = 55,662.51 : x
2. Step 2: Convert to fraction form
   100,987.02/139,355.76 = 55,662.51/x
3. Step 3: Cross multiply
   100,987.02x = 139,355.76 × 55,662.51
4. Step 4: Simplify right side
   100,987.02x = 7,756,891,384.56
5. Step 5: Solve for x
   x = 7,756,891,384.56/100,987.02
6. Step 6: Final answer
   x = 76,810.78