Finding the Fourth Proportional to 100,381.32, 138,528.84 and 55,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   100,381.32 : 138,528.84 = 55,061.28 : x
2. Step 2: Convert to fraction form
   100,381.32/138,528.84 = 55,061.28/x
3. Step 3: Cross multiply
   100,381.32x = 138,528.84 × 55,061.28
4. Step 4: Simplify right side
   100,381.32x = 7,627,575,247.32
5. Step 5: Solve for x
   x = 7,627,575,247.32/100,381.32
6. Step 6: Final answer
   x = 75,986.00