Finding the Fourth Proportional to 100,693.42, 138,956.72 and 57,686.84

Step by Step Solution

1. Step 1: Write the proportion equation
   100,693.42 : 138,956.72 = 57,686.84 : x
2. Step 2: Convert to fraction form
   100,693.42/138,956.72 = 57,686.84/x
3. Step 3: Cross multiply
   100,693.42x = 138,956.72 × 57,686.84
4. Step 4: Simplify right side
   100,693.42x = 8,015,973,523.00
5. Step 5: Solve for x
   x = 8,015,973,523.00/100,693.42
6. Step 6: Final answer
   x = 79,607.72