Finding the Fourth Proportional to 100,808.21, 139,114.23 and 55,485.22

Step by Step Solution

1. Step 1: Write the proportion equation
   100,808.21 : 139,114.23 = 55,485.22 : x
2. Step 2: Convert to fraction form
   100,808.21/139,114.23 = 55,485.22/x
3. Step 3: Cross multiply
   100,808.21x = 139,114.23 × 55,485.22
4. Step 4: Simplify right side
   100,808.21x = 7,718,784,123.27
5. Step 5: Solve for x
   x = 7,718,784,123.27/100,808.21
6. Step 6: Final answer
   x = 76,569.00