Finding the Fourth Proportional to 99,978.24, 137,974.08 and 57,536.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,978.24 : 137,974.08 = 57,536.88 : x
2. Step 2: Convert to fraction form
   99,978.24/137,974.08 = 57,536.88/x
3. Step 3: Cross multiply
   99,978.24x = 137,974.08 × 57,536.88
4. Step 4: Simplify right side
   99,978.24x = 7,938,598,084.07
5. Step 5: Solve for x
   x = 7,938,598,084.07/99,978.24
6. Step 6: Final answer
   x = 79,403.26