Finding the Fourth Proportional to 42,870.14, 64,307.18 and 20,702.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.14 : 64,307.18 = 20,702.16 : x
2. Step 2: Convert to fraction form
   42,870.14/64,307.18 = 20,702.16/x
3. Step 3: Cross multiply
   42,870.14x = 64,307.18 × 20,702.16
4. Step 4: Simplify right side
   42,870.14x = 1,331,297,529.51
5. Step 5: Solve for x
   x = 1,331,297,529.51/42,870.14
6. Step 6: Final answer
   x = 31,054.19