Finding the Fourth Proportional to 142,130.58, 213,307.30 and 99,156.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,130.58 : 213,307.30 = 99,156.56 : x
2. Step 2: Convert to fraction form
   142,130.58/213,307.30 = 99,156.56/x
3. Step 3: Cross multiply
   142,130.58x = 213,307.30 × 99,156.56
4. Step 4: Simplify right side
   142,130.58x = 21,150,818,090.89
5. Step 5: Solve for x
   x = 21,150,818,090.89/142,130.58
6. Step 6: Final answer
   x = 148,812.58