Finding the Fourth Proportional to 100,989.50, 139,364.76 and 55,667.53

Step by Step Solution

1. Step 1: Write the proportion equation
   100,989.50 : 139,364.76 = 55,667.53 : x
2. Step 2: Convert to fraction form
   100,989.50/139,364.76 = 55,667.53/x
3. Step 3: Cross multiply
   100,989.50x = 139,364.76 × 55,667.53
4. Step 4: Simplify right side
   100,989.50x = 7,758,091,261.42
5. Step 5: Solve for x
   x = 7,758,091,261.42/100,989.50
6. Step 6: Final answer
   x = 76,820.77