Finding the Fourth Proportional to 72,688.58, 109,032.56 and 19,380.45

Step by Step Solution

1. Step 1: Write the proportion equation
   72,688.58 : 109,032.56 = 19,380.45 : x
2. Step 2: Convert to fraction form
   72,688.58/109,032.56 = 19,380.45/x
3. Step 3: Cross multiply
   72,688.58x = 109,032.56 × 19,380.45
4. Step 4: Simplify right side
   72,688.58x = 2,113,100,077.45
5. Step 5: Solve for x
   x = 2,113,100,077.45/72,688.58
6. Step 6: Final answer
   x = 29,070.59