Finding the Fourth Proportional to 42,696.91, 64,055.76 and 19,317.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,696.91 : 64,055.76 = 19,317.07 : x
2. Step 2: Convert to fraction form
   42,696.91/64,055.76 = 19,317.07/x
3. Step 3: Cross multiply
   42,696.91x = 64,055.76 × 19,317.07
4. Step 4: Simplify right side
   42,696.91x = 1,237,369,599.82
5. Step 5: Solve for x
   x = 1,237,369,599.82/42,696.91
6. Step 6: Final answer
   x = 28,980.31