Finding the Fourth Proportional to 100,111.48, 138,151.99 and 54,788.54

Step by Step Solution

1. Step 1: Write the proportion equation
   100,111.48 : 138,151.99 = 54,788.54 : x
2. Step 2: Convert to fraction form
   100,111.48/138,151.99 = 54,788.54/x
3. Step 3: Cross multiply
   100,111.48x = 138,151.99 × 54,788.54
4. Step 4: Simplify right side
   100,111.48x = 7,569,145,830.19
5. Step 5: Solve for x
   x = 7,569,145,830.19/100,111.48
6. Step 6: Final answer
   x = 75,607.17