Finding the Fourth Proportional to 42,710.48, 64,071.83 and 13,130.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,710.48 : 64,071.83 = 13,130.79 : x
2. Step 2: Convert to fraction form
   42,710.48/64,071.83 = 13,130.79/x
3. Step 3: Cross multiply
   42,710.48x = 64,071.83 × 13,130.79
4. Step 4: Simplify right side
   42,710.48x = 841,313,678.99
5. Step 5: Solve for x
   x = 841,313,678.99/42,710.48
6. Step 6: Final answer
   x = 19,698.06