Finding the Fourth Proportional to 72,938.34, 100,688.54 and 42,719.49

Step by Step Solution

1. Step 1: Write the proportion equation
   72,938.34 : 100,688.54 = 42,719.49 : x
2. Step 2: Convert to fraction form
   72,938.34/100,688.54 = 42,719.49/x
3. Step 3: Cross multiply
   72,938.34x = 100,688.54 × 42,719.49
4. Step 4: Simplify right side
   72,938.34x = 4,301,362,970.85
5. Step 5: Solve for x
   x = 4,301,362,970.85/72,938.34
6. Step 6: Final answer
   x = 58,972.59