Finding the Fourth Proportional to 102,912, 142,018.56 and 55,808

Step by Step Solution

1. Step 1: Write the proportion equation
   102,912 : 142,018.56 = 55,808 : x
2. Step 2: Convert to fraction form
   102,912/142,018.56 = 55,808/x
3. Step 3: Cross multiply
   102,912x = 142,018.56 × 55,808
4. Step 4: Simplify right side
   102,912x = 7,925,771,796.48
5. Step 5: Solve for x
   x = 7,925,771,796.48/102,912
6. Step 6: Final answer
   x = 77,015.04