Finding the Fourth Proportional to 100,155.61, 138,222.41 and 57,136.05

Step by Step Solution

1. Step 1: Write the proportion equation
   100,155.61 : 138,222.41 = 57,136.05 : x
2. Step 2: Convert to fraction form
   100,155.61/138,222.41 = 57,136.05/x
3. Step 3: Cross multiply
   100,155.61x = 138,222.41 × 57,136.05
4. Step 4: Simplify right side
   100,155.61x = 7,897,482,061.81
5. Step 5: Solve for x
   x = 7,897,482,061.81/100,155.61
6. Step 6: Final answer
   x = 78,852.12