Finding the Fourth Proportional to 99,768.32, 137,680 and 55,056

Step by Step Solution

1. Step 1: Write the proportion equation
   99,768.32 : 137,680 = 55,056 : x
2. Step 2: Convert to fraction form
   99,768.32/137,680 = 55,056/x
3. Step 3: Cross multiply
   99,768.32x = 137,680 × 55,056
4. Step 4: Simplify right side
   99,768.32x = 7,580,110,080
5. Step 5: Solve for x
   x = 7,580,110,080/99,768.32
6. Step 6: Final answer
   x = 75,977.12